The Lew Electric 1103-SMB is a stamped steel concrete floor box with a three gang opening. The box is fully adjustable with just a screwdriver offering 2 1/4″ of pre-pour adjustment, and 1/2″ of post pour adjustment. The box is deep offering 38.3 cubic inches of interior space per gang. There are several 3/4″, 1″, and 1.25″ knockouts on the box to run your wires to. The box ships with a protective cement cap to keep the box clean and safe during concrete pouring. The box does not ship with a cover, there are several options available that are sold separately. If the box is to be used in a carpeted area a sold separately carpet flange can be ordered, the CF-1100 series carpet flange adds 3/8″ of height to accommodate the carpet and padding. For tile or carpet applications using a flange, make sure that the floor box is 3/8″ lower than the concrete pour, if you are not using a flange simply pour your concrete to the top of the tile frame less the thickness of the tile. The box is UL listed for the USA, and cUL listed for Canada installations.